Investigation of problems with the Timken AP Roller Bearing Unit (TM-TRIB-25)

AP Roller Bearing Units, manufactured by Messrs Timken Limited, were introduced on B.R. freightliner vehicles approximately 6 years ago. Their performance has been entirely satisfactory until recently when a number of Units have developed sufficiently high operating temperatures to trigger-off lineside hot box detectors. It is significant that the hot...